Advocates for private-school choice celebrated this week as a federal schools voucher bill moved closer to becoming law, a major milestone that eluded their movement during President Trump’s first term.

The House Republican budget proposal that advanced on Monday would devote $5 billion to federal vouchers for private-school tuition, home-schooling materials and for-profit virtual learning.

The program in the budget bill could bring vouchers to all 50 states for the first time, including Democratic-leaning ones that have long rejected the idea.

Supporters hailed the proposal as “historic” and a “huge win,” but some cautioned that there was still much legislative haggling ahead.

“Ultimately, every child, especially from lower-income families, should have access to the school of their choice, and this legislation is the only way to make that happen,” said Tommy Shultz, chief executive of the American Federation for Children, a private-school choice advocacy group.

Opponents of the proposal were stunned at its sweeping implications. While it is in line with President Trump’s agenda, it had been considered somewhat of a long shot to make it out of the House Ways and Means Committee, because of its cost.